| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a voltage regulation device which individually calculates load currents of single-phase loads. <P>SOLUTION: The voltage regulation device includes: a series transformer T1a which is connected to a pole transformer 1 of a three-phase four-wire power distribution system and connected to an R-phase, an N-phase, an S-phase, and a T-phase low-voltage power distribution line of a three-phase four-wire system, and has a primary winding T1ap connected to an R-phase low-voltage power distribution line 1cR; and a series transformer T2a which has a primary winding T2ap connected to an S-phase low-voltage power distribution line 1cS. The voltage regulation device supplies electric power to loads 3a-3e which are connected to a plurality of points between a power transmission terminal and an end terminal of the low-voltage power distribution lines and regulates voltages of the primary windings T1ap, T2ap. The voltage regulation device includes: current detectors 22a-22c which detect R-phase and S-phase load currents of the R-phase, S-phase, and T-phase low-voltage power distribution lines and a three-phase load current of the T phase; a voltage detector 23 which detects inter-line voltages of the R-phase, S-phase, and T-phase low-voltage power distribution lines; and a voltage regulation circuit 20 which regulates voltages of secondary windings T1as, T2as of the series transformer so that the voltage from the power transmission terminal to the end terminal is within a specified value on the basis of single-phase load currents of R phase and S phase obtained by subtracting a three-phase load current of the T phase from load currents of the R phase and S phase, the respective inter-line voltages, and power distribution line impedance of the low-voltage power distribution lines. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
